Over zealous ABS

mach1rob · 24th January 2007, 19:14

Anyone experienced this before?

Normal braking not hard, just normal stopping for a junction etc, just before you come to a complete halt you can feel the brake pedal pulse as the ABS cuts in. No where near a skid or loosing traction. Have checked all the tyres, and they are all the same size. ABS light comes on at first switch on, and extinguishes after a few seconds as it should, and remains off.

Any ideas before the FOBBS comes out to play?

Simon · 24th January 2007, 19:18

FOBBS ???

If the cars ECU is detecting a skid situation then the ABS will activate. I would expect it to be doing thiss quite a lot at the moment due to the cold weather, icy/wet roads etc. The salt/grit combination can cause wheels to lock prematurely too.

Even if for one split second a wheel locks the ABS will activate. It's that split second that'll save your life one day....

black olive · 24th January 2007, 19:18

sh*tty damp salty leafy cold roads !!!!

GreyGhost · 24th January 2007, 19:22

3 times in the 2 years and 3 months of ownership I have felt this at very low speed and on non slippery surfaces, just as the car came to a halt. No explanation and otherwise perfectly normal operation. If it happened 3 times in a matter of days I would be worried but spead over that entire time, go figure.

Rich · 24th January 2007, 19:27

Word of caution Rob (well, everyone really), I had EXACTLY the same symptoms a couple of years ago and after 101 tests and looking at things, no ABS fault found.

Turned out to be the inside of the rear discs, quite shocking to be honest, the car passed an MOT like this:

Replaced with shiny versions:

And no problems since.

I presume it was a bodge MOT hence it passed, but you'd only see this damage on the inside by taking the wheel off, the outside faces were perfect. Note, this corrosion was on the inside of BOTH rear discs

Simon · 24th January 2007, 19:32

That's a bit worrying Rich.....

Mine car's not doing the symptoms described but now I wanna check my discs regardless.... damn these (freezing) cold nights and the darkness....

mach1rob · 24th January 2007, 19:32

Normally I would expect it this weather, but this was happening on dry roads, we've had no rain or snow down here, but this was several times, on various different surfaces, it strikes me as it 'thinks' it's going into a skid even when you're quite a way off that point.

Rich, I'll double check, but there's a receipt in paperwork for new discs and pads all round within the past 6 months.

Oh and Simon, FOBBS **** Off Big Beating Stick

GreyGhost · 24th January 2007, 19:33

Thanks Rich, I suppose it is possible mine were / are corroded, first time it happened was just 3 or 4 weeks after I bought it new. I'll get it checked next time wheels come off. 2 front tyre due in a month or so.

Simon · 24th January 2007, 19:35

Quote:

Originally Posted by mach1rob

Oh and Simon, FOBBS **** Off Big Beating Stick

I'm shocked! :SHOCKED:To think you'd beat your loved one....

:lol:

Rich · 24th January 2007, 19:37

Hmm, thinking about it now, IIRC, you can't see the damage/corrosion on the back of the rear discs because of the dust shield in place.

Sorry, it was so long ago now, can't remember, but you might be able to peek through somewhere to take a look?

It'll stand out a mile if they're bad, but I'm sure I didn't find this out until we actually took the discs off.

Anyway, worth checking if you can get to them easily!

24th January 2007, 19:14	#1
mach1rob Gets stuck in Join Date: Jan 2007 Posts: 889 Thanks: 0 Thanked 1 Time in 1 Post	Over zealous ABS Anyone experienced this before? Normal braking not hard, just normal stopping for a junction etc, just before you come to a complete halt you can feel the brake pedal pulse as the ABS cuts in. No where near a skid or loosing traction. Have checked all the tyres, and they are all the same size. ABS light comes on at first switch on, and extinguishes after a few seconds as it should, and remains off. Any ideas before the FOBBS comes out to play?

24th January 2007, 19:27	#5
Rich Posted a thing or two http://Roadca.ms - Letting you see what they see! Join Date: Nov 2006 Location: Yup Posts: 1,786 Thanks: 0 Thanked 7 Times in 1 Post	Word of caution Rob (well, everyone really), I had EXACTLY the same symptoms a couple of years ago and after 101 tests and looking at things, no ABS fault found. Turned out to be the inside of the rear discs, quite shocking to be honest, the car passed an MOT like this: Replaced with shiny versions: And no problems since. I presume it was a bodge MOT hence it passed, but you'd only see this damage on the inside by taking the wheel off, the outside faces were perfect. Note, this corrosion was on the inside of BOTH rear discs __________________ https://VehicleGPS.UK http://www.MotorwayCameras.co.uk

24th January 2007, 19:37	#10
Rich Posted a thing or two http://Roadca.ms - Letting you see what they see! Join Date: Nov 2006 Location: Yup Posts: 1,786 Thanks: 0 Thanked 7 Times in 1 Post	Hmm, thinking about it now, IIRC, you can't see the damage/corrosion on the back of the rear discs because of the dust shield in place. Sorry, it was so long ago now, can't remember, but you might be able to peek through somewhere to take a look? It'll stand out a mile if they're bad, but I'm sure I didn't find this out until we actually took the discs off. Anyway, worth checking if you can get to them easily! __________________ https://VehicleGPS.UK http://www.MotorwayCameras.co.uk

24th January 2007, 19:18	#2
Simon Banned - Join Date: Nov 2006 Location: - Posts: 10,318 Thanks: 0 Thanked 4 Times in 3 Posts	FOBBS ??? If the cars ECU is detecting a skid situation then the ABS will activate. I would expect it to be doing thiss quite a lot at the moment due to the cold weather, icy/wet roads etc. The salt/grit combination can cause wheels to lock prematurely too. Even if for one split second a wheel locks the ABS will activate. It's that split second that'll save your life one day....

24th January 2007, 19:18	#3
black olive I really should get out more....... 260 SE vin 214 ( last mark 1 260 ) Join Date: Dec 2006 Location: Lancashire Posts: 2,009 Thanks: 1 Thanked 8 Times in 4 Posts	sh*tty damp salty leafy cold roads !!!!

24th January 2007, 19:22	#4
GreyGhost Banned 180+ Sport Auto Join Date: Oct 2006 Location: Bedford Middle Level Posts: 17,787 Thanks: 0 Thanked 18 Times in 5 Posts	3 times in the 2 years and 3 months of ownership I have felt this at very low speed and on non slippery surfaces, just as the car came to a halt. No explanation and otherwise perfectly normal operation. If it happened 3 times in a matter of days I would be worried but spead over that entire time, go figure.

24th January 2007, 19:32	#6
Simon Banned - Join Date: Nov 2006 Location: - Posts: 10,318 Thanks: 0 Thanked 4 Times in 3 Posts	That's a bit worrying Rich..... Mine car's not doing the symptoms described but now I wanna check my discs regardless.... damn these (freezing) cold nights and the darkness....

24th January 2007, 19:33	#8
GreyGhost Banned 180+ Sport Auto Join Date: Oct 2006 Location: Bedford Middle Level Posts: 17,787 Thanks: 0 Thanked 18 Times in 5 Posts	Thanks Rich, I suppose it is possible mine were / are corroded, first time it happened was just 3 or 4 weeks after I bought it new. I'll get it checked next time wheels come off. 2 front tyre due in a month or so.